Port 3621Epson Network Screen

Epson Network Screen traffic for SEIKO EPSON network display equipment.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as ep-nsp

Technical Details

what runs on :3621

Epson Network Screen is a proprietary display and presentation protocol registered for both TCP and UDP on port 3621. Implementations may use the transports for discovery, session setup, control, and screen or image data, but Epson does not provide a generally standardized public wire format or a universal handshake description for the service. The port is normally encountered on Epson network projectors and should not be confused with a generic video-streaming or web-management port.

Security Information

exposure of :3621

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.7 across 1,468 ports — this one sits 0.7 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

This service is intended for trusted local presentation networks and should not be exposed directly to the Internet. An exposed projector may disclose device information or accept unwanted presentation and control traffic; legacy deployments should not be assumed to provide modern transport encryption or strong authentication. Restrict access to the presentation VLAN or trusted management hosts.

Record

iana registry entry

port: :3621
service: Epson Network Screen
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Media
usage: This port is used by Epson network-capable projectors for network screen display and related presentation functions, including software such as Epson EasyMP Network Projection. It is most often found on projectors or presentation devices on a local network, not on general-purpose servers.
lookups: 0rank 993
added: 2026-09-12
updated: 2026-09-22
references: IANA service name registry — port 3621

Something wrong?

This record is maintained by the engineers who use port 3621. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-22.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 1,468 in network services →

the 8 most looked-up other ports in network services — 1,468 ports carry that label.

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:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3621Epson Network Screen

Technical Details

Security Information

Related Ports

Port 3621Epson Network Screen